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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d3fda4c912e6a1aa2d2ac63e6f8dbc2ffe787876a8eb8ff1ce373bb1bd050f0' 
  AND token = 'K8jM5BVdZPErmbaUdaUZe48+VCib7iqTfqmn+StWfEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}